JPH0392093A - Movement detection circuit - Google Patents
Movement detection circuitInfo
- Publication number
- JPH0392093A JPH0392093A JP1229953A JP22995389A JPH0392093A JP H0392093 A JPH0392093 A JP H0392093A JP 1229953 A JP1229953 A JP 1229953A JP 22995389 A JP22995389 A JP 22995389A JP H0392093 A JPH0392093 A JP H0392093A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- absolute value
- output
- component
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ＮＴＳＣ方式の複合テレビジョン信号をデ
ィジタル処理で再生する装置において、画像の動き情報
を抽出する動き検出回路に関し、特に輝度信号の動き情
報のみを抽出することができる動き検出回路に関するも
のである．（従来の技術）
第２図は例えば特開昭６１−７０８８８号公報に示され
た従来の動き検出回路を示すブロック図であり、図にお
いて、１はディジタル量のＮＴＳＣ信号の入力端子、２
は入力端子ｌに到来する信号を入力とするフレームメモ
リ、３はフレームメモリ２の出力を入力とするフレーム
メモリ、４は入力端子１に到来する信号とフレームメモ
リ２の出力を入力とする減算器、５は減算器４の出力を
入力とする低域通過フィルタ、６は低域通過フィルタ５
の出力を入力とする絶対値回路、７は入力端子１に到来
する信号とフレームメモリ３の出力を入力とする減算器
、８は減算器７の出力を入力とする帯域通過フィルタ、
９は帯域通過フィルタ８の出力を入力とする絶対値回路
、１０は絶対値回路６の出力と絶対値回路９の出力を入
力とする加算器、１１は加算器１０の出力端子である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motion detection circuit for extracting motion information of an image in a device that reproduces an NTSC composite television signal by digital processing, and in particular relates to a motion detection circuit for extracting motion information of an image. It concerns a motion detection circuit that can extract only motion information. (Prior Art) FIG. 2 is a block diagram showing a conventional motion detection circuit disclosed in, for example, Japanese Unexamined Patent Publication No. 61-70888. In the figure, 1 is an input terminal for a digital NTSC signal;
3 is a frame memory whose input is the signal arriving at input terminal l; 3 is a frame memory whose input is the output of frame memory 2; and 4 is a subtracter whose inputs are the signal arriving at input terminal 1 and the output of frame memory 2. , 5 is a low-pass filter that receives the output of the subtracter 4, and 6 is a low-pass filter 5.
7 is a subtracter that receives the signal arriving at input terminal 1 and the output of frame memory 3 as input; 8 is a bandpass filter that receives the output of subtractor 7;
9 is an absolute value circuit which receives the output of the bandpass filter 8 as an input; 10 is an adder which receives the outputs of the absolute value circuit 6 and the absolute value circuit 9; and 11 is an output terminal of the adder 10.
次に動作について説明する．入力端子１に入力されたデ
ィジタル量のＮＴＳＣ信号は縦続接続された１フレーム
容量のフレームメモリ２．３に入力され、１フレーム周
期前、および２フレーム周期前の信号との差が減算器４
．７で算出される．減算器４で得られたフレーム間差信
号は低域通過フィルタ５に入力され、水平周波数の低い
輝度信号成分が抽出される．低域通過フィルタ５の通過
域を第３図（ａ）に示す．又減算器７で算出された２フ
レーム間の差信号は帯域通過フィルタ８に入力され、水
平周波数の高い輝度信号成分と色信号成分が抽出される
。帯域通過フィルタ８の通過域を第３図（ロ）に示す．
色信号の副搬送波の位相は、２フレーム周期で元に戻る
ので、静止画像の場合帯域通過フィルタ８の出力は零と
なる．そして、色信号か輝度信号の高域成分に何らかの
変化があれば、零でない有意の信号が絶対値回路９から
得られ、色信号と輝度信号の高域成分に対する動き情報
として利用できる．同様に、静止画像の場合低域通過フ
ィルタ５の出力は零となる．そして、輝度信号の低域成
分に何らかの変化があれば、零でない有意の信号が絶対
値回路６から得られ、輝度信号の低域成分に対する動き
情報として利用できる．従って、絶対値回路６の出力と
して得た動き情報と、絶対値回路９の出力として得た動
き情報とを加算回路１Ｏで加えることにより、出力端子
１１にはＮＴＳＣ信号に含まれている被写体の動き情報
が得られる．
〔発明が解決しようとする課題〕
従来の動き検出回路は以上のように構威されているので
、輝度信号成分のみの動き情報を得るのが困難であると
いう問題点があった．
この発明は上記のような問題点を解消するためにな′さ
れたもので、輝度信号成分のみの動き情報を良好に抽出
することのできる動き検出回路を得ることを目的とする
．
〔課題を解決するための手段〕
この発明に係る動き検出回路は、入力信号を１フレーム
期間遅延するフレームメモリと、該フレームメモリの出
力信号と上記入力信号から輝度信号の水平方向周波数の
低い成分の１フレーム間差分の絶対値を求める手段と、
上記フレームメモリの出力信号を１フレーム期間遅延す
るフレームメモリと、該フレームメモリの出力信号と上
記入力信号から輝度信号の水平方向周波数の高い成分と
色信号成分の２フレーム間差分の絶対値を求める手段と
、上記入力信号と上記２つのフレームメモリの出力信号
を入力信号とし、その通過域がＮＴＳＣ方式の複合テレ
ビジョン信号を垂直方向周波数と時間方向周波数で表現
するときの色信号成分と共役な領域である時空間フィル
タと、該時空間フィルタの出力信号の水平方向周波数の
高い成分の絶対値を求める手段と、該絶対値と上記２フ
レーム間差分の絶対値を入力信号とし該入力信号のうち
いずれかを出力する判定回路と、該判定回路の出力信号
と上記ｌフレーム間差分の論理和を求める手段とを備え
たものである．
〔作用〕
この発明においては、入力信号．１フレーム遅延信号．
および２フレーム遅延信号を入力とし、ＮＴＳＣ方式の
複合テレビジョン信号を垂直方向周波数と時間方向周波
数で表現するときの色信号成分と共役な領域を通過域と
する時空間フィルタを備え、判定回路により該時空間フ
ィルタの出力信号の水平方向周波数の高い成分の絶対値
と輝度信号の水平方向周波数の高い成分と色信号成分の
２フレーム間差分の絶対値のいずれかを輝度信号の水平
周波数の高い成分の動き検出データとして得る構成とし
たから、輝度信号成分のみの動き情報を良好に抽出する
ことができる，
〔実施例〕
以下、この発明の一実施例を図について説明する．
第１図は本発明の一実施例による動き検出回路の構威を
示すプロ・冫ク図であり、図において、第２図と同一符
号は同一または相当部分であり、１０は絶対値回路６の
出力と判定回路１５の出力を入力とする加算器、１１は
加算器１０の出力端子、１２はフレームメモリ２の入力
および出力と、フレームメモリ３の出力を入力とする時
空間フィルタ、１３は時空間フィルタｌ２の出力を人力
とする帯域通過フィルタ、１４は帯域通過フィルタエ３
の出力を入力とする絶対値回路、１５は絶対値回路９の
出力と絶対値回路１４の出力を入力とする判定回路であ
る．
次に動作について説明する．フレームメモリ２の出力信
号と入力端子１に入力される入力信号から輝度信号の水
平方向周波数の低い成分の１フレーム間差分の絶対値を
求める動作、フレームメモリ３の出力信号と入力端子゛
ｌに入力される入力信号から輝度信号の水平方向周波数
の高い戊分と色信号戊分の２フレーム間差分の絶対値を
求める動作については従来例と同じである．第４図（ａ
）に動きがほとんどない場合の輝度信号（以下Ｙとする
）と色信号（以下Ｃとする）の垂直方向空間周波数（以
下νとする）成分と時間方向空間周波数（以下ｆとする
）成分の帯域を、第４図（ロ）に動きが激しい場合のＹ
およびＣのν成分およびｒ成分の帯域を示す．また絶対
値回路９の出力のν成分およびｆ成分の通過帯域（０〜
（−６ｄＢ））を第５図（ａ）に示す．第４図（ａ）と
第５図（ａ）から、動きがほとんどない場合は、絶対値
回路９の出力はＯに近いことがわかる．しかし、第４図
（ロ）と第５図（ａ）からわかるように、動きが激しい
ときは、Ｙ成分とＣ成分の両方が絶対値回路９の出力に
有意の値として得られる．一方、時空間フィルタ１２は
、その出力のν成分とｆｔｃ分の通過帯域（Ｏ〜（−６
ｄＢ））が第５図Ｃｂ）に示すもので、第４図（ロ）と
第５図（ｂ）より、時空間フィルタ１２の出力は、動き
が激しい場合のＹｄ分のみを抽出していることがわかる
．
次に時空間フィルタ１２の具体的な構或例を第６図につ
いて説明する。加算器１６は、入力端子１に到来する入
力信号と入力端子１の信号の１フレーム遅れの信号と入
力端子１の信号の２フレーム遅れの信号を入力とし、そ
れぞれを（−２）倍，（％）倍． （−！，’；）倍
して加算する．加算器１６の出力のν成分とｆ成分の通
過帯域（Ｏ〜（−６ｄＢ））を第７図（ａ）に示す．ラ
インメモリ１７は、加算器１６の出力をｌ水平走査期間
遅延する．ラインメモリ１８は、ラインメモリ１７の出
力を１水平走査期間遅延する。加算器１９は、加算器１
６の出力と、加算器１６の出力の１ライン遅れの信号と
、加算器１６の出力の２ライン遅れの信号を入力とし、
それぞれを（一ス）倍． （Ａ）倍．（−％）倍して加
算する．ラインメモリｌ７の入力に対する加算器１９の
出力のν成分とｆ成分の通過帯域（０〜（−６ｄＢ））
を第７図（ｂ）に示す。Next, we will explain the operation. The digital NTSC signal input to the input terminal 1 is input to a cascade-connected frame memory 2.3 with a capacity of 1 frame, and the difference between the signal from one frame period before and two frame periods before is sent to a subtracter 4.
．． It is calculated as 7. The inter-frame difference signal obtained by the subtracter 4 is input to a low-pass filter 5, where a luminance signal component with a low horizontal frequency is extracted. The passband of the low-pass filter 5 is shown in FIG. 3(a). Furthermore, the difference signal between the two frames calculated by the subtracter 7 is input to a band pass filter 8, where a luminance signal component and a color signal component with high horizontal frequencies are extracted. The pass band of the band pass filter 8 is shown in Figure 3 (b). Since the phase of the subcarrier of the color signal returns to its original state every two frames, the output of the bandpass filter 8 becomes zero in the case of a still image. If there is any change in the high frequency components of the chrominance signal or the luminance signal, a significant non-zero signal is obtained from the absolute value circuit 9 and can be used as motion information for the high frequency components of the chrominance signal and the luminance signal. Similarly, in the case of a still image, the output of the low-pass filter 5 is zero. If there is any change in the low frequency component of the luminance signal, a significant non-zero signal is obtained from the absolute value circuit 6 and can be used as motion information for the low frequency component of the luminance signal. Therefore, by adding the motion information obtained as the output of the absolute value circuit 6 and the motion information obtained as the output of the absolute value circuit 9 in the adding circuit 1O, the output terminal 11 receives the information of the subject included in the NTSC signal. Movement information can be obtained. [Problems to be Solved by the Invention] Since the conventional motion detection circuit is configured as described above, there is a problem in that it is difficult to obtain motion information from only the luminance signal component. This invention was made to solve the above-mentioned problems, and the object is to obtain a motion detection circuit that can satisfactorily extract motion information of only luminance signal components. [Means for Solving the Problems] A motion detection circuit according to the present invention includes a frame memory that delays an input signal by one frame period, and a low horizontal frequency component of a luminance signal from the output signal of the frame memory and the input signal. means for determining the absolute value of the difference between one frame;
A frame memory that delays the output signal of the frame memory for one frame period, and the absolute value of the difference between two frames between the high horizontal frequency component of the luminance signal and the color signal component from the output signal of the frame memory and the input signal. means, the input signal and the output signals of the two frame memories are used as input signals, and the passband thereof is conjugate with a color signal component when expressing an NTSC system composite television signal in terms of vertical frequency and temporal frequency. a spatio-temporal filter which is a domain; a means for determining the absolute value of a component with a high horizontal frequency of an output signal of the spatio-temporal filter; The apparatus is equipped with a judgment circuit that outputs one of them, and a means for calculating the logical sum of the output signal of the judgment circuit and the difference between the l frames. [Operation] In this invention, the input signal. 1 frame delayed signal.
and a 2-frame delayed signal as input, and a spatio-temporal filter whose passband is a region conjugate to the color signal component when expressing an NTSC composite television signal in terms of vertical frequency and temporal frequency. Either the absolute value of the high horizontal frequency component of the output signal of the spatiotemporal filter or the absolute value of the difference between two frames between the high horizontal frequency component of the luminance signal and the color signal component is determined as the high horizontal frequency component of the luminance signal. Since the configuration is such that the motion information is obtained as component motion detection data, motion information of only the luminance signal component can be extracted satisfactorily. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the structure of a motion detection circuit according to an embodiment of the present invention. In the diagram, the same reference numerals as in FIG. 11 is an output terminal of the adder 10, 12 is a space-time filter that receives the input and output of the frame memory 2, and the output of the frame memory 3; 14 is a band-pass filter in which the output of the spatio-temporal filter l2 is input manually; 14 is a band-pass filter 3
15 is a determination circuit that receives the outputs of the absolute value circuit 9 and the absolute value circuit 14 as inputs. Next, we will explain the operation. The operation of calculating the absolute value of the difference between one frame of the low horizontal frequency component of the luminance signal from the output signal of frame memory 2 and the input signal input to input terminal 1, and the output signal of frame memory 3 and the input signal input to input terminal 1. The operation of calculating the absolute value of the difference between two frames between the high frequency horizontal component of the luminance signal and the component of the chrominance signal from the input signal is the same as in the conventional example. Figure 4 (a
) and the vertical spatial frequency (hereinafter referred to as ν) component and the temporal spatial frequency (hereinafter referred to as f) component of the luminance signal (hereinafter referred to as Y) and the color signal (hereinafter referred to as C) when there is almost no movement. The band is shown in Fig. 4 (b) as Y when there is rapid movement.
and shows the bands of the ν and r components of C. In addition, the passband (0 to
(-6dB)) is shown in Figure 5(a). From FIG. 4(a) and FIG. 5(a), it can be seen that when there is almost no movement, the output of the absolute value circuit 9 is close to O. However, as can be seen from FIGS. 4(b) and 5(a), when the movement is rapid, both the Y component and the C component are obtained as significant values in the output of the absolute value circuit 9. On the other hand, the spatio-temporal filter 12 has a passband (O~(-6
dB)) is shown in Fig. 5Cb), and from Fig. 4(b) and Fig. 5(b), the output of the spatiotemporal filter 12 extracts only Yd when the movement is intense. I understand that. Next, a specific example of the structure of the spatio-temporal filter 12 will be explained with reference to FIG. The adder 16 inputs the input signal arriving at the input terminal 1, the signal at the input terminal 1 delayed by 1 frame, and the signal at the input terminal 1 delayed by 2 frames, and multiplies them by (-2) and ( %) times. (-!,';) Multiply and add. The passbands (O~(-6 dB)) of the ν and f components of the output of the adder 16 are shown in FIG. 7(a). Line memory 17 delays the output of adder 16 by l horizontal scanning period. Line memory 18 delays the output of line memory 17 by one horizontal scanning period. Adder 19 is adder 1
6, a signal delayed by one line from the output of the adder 16, and a signal delayed by two lines from the output of the adder 16,
Multiply each by (1s). (A) times. Multiply by (-%) and add. Passband (0 to (-6 dB)) of the ν and f components of the output of the adder 19 for the input of the line memory l7
is shown in FIG. 7(b).
フィールドメモリ２０は、加算器１９の出力を１フィー
ルド期間（２６３水平走査期間）遅延する．フィールド
メモリ２１は、フィールドメモリ２０の出力を１フィー
ルド期間遅延する．加算器２２は、加算器１９の出力と
、加算器１９の出力の１フィールド遅れの信号と、加算
器１９の出力の２フィールド遅れの信号を入力とし、そ
れぞれを（一ス）倍．（％）倍， （−！，’；）倍
して加算する．フィールドメモリ２０の入力に対する加
算器２２の出力のν成分とｒｔｃ分の通過帯域（０〜（
−６ｄＢ））を第７図（Ｃ）に示す．入力端子１の入力
に対する加算器２２の出力のν成分とｒ成分の通過帯域
（０ 〜（−６ｄＢ））は、第７図（ａ） 〜（Ｃ）
（７）通過帯域のフィルタの縦続接続の通過帯域になる
ので、第５図６）に相当する．帯域通過フィルタ１３は
、帯域通過フィルタ８と同じ周波数特性のもので、加算
器２２の出力のうちの水平方向周波数の高い成分を抽出
する．
絶対値回路１４は、帯域通過フィルタｌ３の出力の絶対
僅を出力する．判定回路１５は、絶対値回路９の出力と
絶対値回路ｌ４の出力の値を比較して、輝度信号の水平
周波数の高い成分の動き検出データを決定する．例えば
、絶対値回路９の出力の値が小さな値の場合は、第４図
（ａ）の場合に相当するので、絶対値回路９の出力をそ
のまま判定回路ｌ５の出力とする．絶対値回路９の出力
の値が大きな場合は、第４図（ａ）以外の場合なので、
絶対値回路１４の出力を判定回路１５の出力とする．こ
うして、輝度信号の水平周波数の低い成分の動き検出デ
ータが絶対値回路６の出力に、輝度信号の水平周波数の
高い成分の動き検出データが判定回路１５の出力に得ら
れる．これらは、加算器ｌＯで加真されるので、出力端
子１１に輝度信号の動き検出データが出力される。Field memory 20 delays the output of adder 19 by one field period (263 horizontal scanning periods). Field memory 21 delays the output of field memory 20 by one field period. The adder 22 inputs the output of the adder 19, a signal delayed by one field from the output of the adder 19, and a signal delayed by two fields from the output of the adder 19, and multiplies each by (one step). (%) times, (-!,';) times and add. The ν component of the output of the adder 22 and the passband (0 to (
-6dB)) is shown in Figure 7(C). The passbands (0 to (-6 dB)) of the ν and r components of the output of the adder 22 with respect to the input of the input terminal 1 are shown in FIGS. 7(a) to (C).
(7) Since this is the passband of the cascade connection of passband filters, it corresponds to 6) in Fig. 5. The band-pass filter 13 has the same frequency characteristics as the band-pass filter 8, and extracts high horizontal frequency components from the output of the adder 22. The absolute value circuit 14 outputs the absolute value of the output of the bandpass filter l3. The determination circuit 15 compares the values of the output of the absolute value circuit 9 and the output of the absolute value circuit 14, and determines the motion detection data of the high horizontal frequency component of the luminance signal. For example, if the value of the output of the absolute value circuit 9 is a small value, this corresponds to the case shown in FIG. 4(a), so the output of the absolute value circuit 9 is directly used as the output of the determination circuit 15. If the value of the output of the absolute value circuit 9 is large, the case is other than that shown in FIG. 4(a), so
The output of the absolute value circuit 14 is assumed to be the output of the determination circuit 15. In this way, the motion detection data of the low horizontal frequency component of the luminance signal is obtained as the output of the absolute value circuit 6, and the motion detection data of the high horizontal frequency component of the luminance signal is obtained as the output of the determination circuit 15. These are added by the adder IO, so that motion detection data of the luminance signal is output to the output terminal 11.
以上のように、この発明によれば、入力信号を１フレー
ム期間遅延するフレームメモリと、該フレームメモリの
出力信号と上記入力信号から輝度信号の水平方向周波数
の低い成分の１フレーム間差分の絶対値を求める手段と
、上記フレームメモリの出力信号を１フレーム期間遅延
するフレームメモリと、該フレームメモ′りの出力信号
と上記入力信号から輝度信号の水平方向周波数の高い成
分と色信号成分の２フレーム間差分の絶対値を求める手
段と、上記入力信号と上記２つのフレームメモリの出力
信号を入力信号とし、その通過域がＮＴＳＣ方式の複合
テレビジョン信号を垂直方向周波数と時間方向周波数で
表現するときの色信号成分と共役な領域である時空間フ
ィルタと、該時空間フィルタの出力信号の水平方向周波
数の高い成分の絶対値を求める手段と、該絶対値と上記
２フレーム間差分の絶対値を入力信号とし該入力信号の
うちいずれかを出力する判定回路と、該判定回路の出力
信号と上記１フレーム間差分の論理和を求める手段とを
備えた構戒としたから、輝度信号のみの動き検出データ
を正確に得られる効果がある．As described above, according to the present invention, there is provided a frame memory that delays an input signal by one frame period, and an absolute difference between one frame between the output signal of the frame memory and the low horizontal frequency component of the luminance signal from the input signal. a frame memory for delaying the output signal of the frame memory for one frame period; and a frame memory for determining a high horizontal frequency component of a luminance signal and a color signal component from the output signal of the frame memory and the input signal. means for determining the absolute value of the inter-frame difference; the input signal and the output signals of the two frame memories are used as input signals, and a composite television signal whose passband is an NTSC system is expressed in terms of a vertical frequency and a temporal frequency; a spatio-temporal filter that is a region conjugate with the color signal component of the time; means for determining the absolute value of a component with a high horizontal frequency of the output signal of the spatio-temporal filter; and an absolute value of the absolute value and the difference between the two frames. Since the system is equipped with a judgment circuit that takes the input signal as an input signal and outputs one of the input signals, and a means for calculating the logical sum of the output signal of the judgment circuit and the above-mentioned one-frame difference, it is possible to calculate only the luminance signal. This has the effect of accurately obtaining motion detection data.
第１図はこの発明の一実施例による動き検出回路のブロ
ック図、第２図は従来の動き検出回路のブロック図、第
３図（ａ）． （ｂ）はそれぞれ低域．高域の水平方向
フィルタの周波数特性図、第４図（ａ），（ロ）はそれ
ぞれ動きの小さい場合．大きい場合の輝度信号と色信号
の垂直方向と時間方向の周波数特性図、第５図（ａ），
（ハ）はそれぞれ絶対僅回路９．時空間フィルタ１２の
垂直方向と時間方向の通過域を示す周波数特性図、第６
図は時空間フィルタのブロック図、第７図は時空間フィ
ルタの各部分での垂直方向と時間方向の周波数特性図で
ある．１・・・入力端子、２．゛３・・・フレームメモ
リ、４．７・・・減真器、５・・・低域通過フィルタ，
６．９．１４・・・絶対値回路，８．１３・・・帯域通
過フィルタ，１０．１６．１９．２２・・・加算器、１
１・・・出力端子、１２・・・時空間フィルタ、１５・
・・判定回路、ｌ７，１８・・・ラインメモリ、２０．
２１・・・フィールドメモリである．FIG. 1 is a block diagram of a motion detection circuit according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional motion detection circuit, and FIG. 3(a). (b) is the low range. Frequency characteristic diagrams of the high-pass horizontal filter, Figures 4 (a) and (b) are for cases where the movement is small, respectively. Frequency characteristic diagram in the vertical direction and time direction of the luminance signal and color signal when large, Fig. 5 (a),
(c) is an absolute small circuit 9. Frequency characteristic diagram showing vertical and temporal passbands of the spatio-temporal filter 12, No. 6
The figure is a block diagram of the spatio-temporal filter, and Figure 7 is a diagram of the frequency characteristics in the vertical and temporal directions of each part of the spatio-temporal filter. 1...input terminal, 2.゛3... Frame memory, 4.7... Attenuator, 5... Low pass filter,
6.9.14...Absolute value circuit, 8.13...Band pass filter, 10.16.19.22...Adder, 1
1... Output terminal, 12... Space-time filter, 15.
. . . Determination circuit, l7, 18 . . . Line memory, 20.
21...Field memory.
Claims (1)
いる被写体の動き情報をディジタル処理で抽出する動き
検出回路において、 入力信号を１フレーム期間遅延するフレームメモリと、 該フレームメモリの出力信号と上記入力信号から輝度信
号の水平方向周波数の低い成分の１フレーム間差分の絶
対値を求める手段と、 上記フレームメモリの出力信号を１フレーム期間遅延す
るフレームメモリと、 該フレームメモリの出力信号と上記入力信号から輝度信
号の水平方向周波数の高い成分と色信号成分の２フレー
ム間差分の絶対値を求める手段と、上記入力信号と上記
２つのフレームメモリの出力信号を入力信号とし、その
通過域がＮＴＳＣ方式の複合テレビジョン信号を垂直方
向周波数と時間方向周波数で表現するときの色信号成分
と共役な領域である時空間フィルタと、 該時空間フィルタの出力信号の水平方向周波数の高い成
分の絶対値を求める手段と、 該絶対値と上記２フレーム間差分の絶対値を入力信号と
し、該入力信号のうちいずれかを出力する判定回路と、 該判定回路の出力信号と上記１フレーム間差分の論理和
を求める手段とを備えたことを特徴とする動き検出回路
。(1) A motion detection circuit that uses digital processing to extract motion information of a subject contained in an NTSC composite television signal, which includes a frame memory that delays an input signal by one frame period, an output signal of the frame memory, and the above. means for determining the absolute value of the one-frame difference of the low horizontal frequency component of the luminance signal from the input signal; a frame memory for delaying the output signal of the frame memory for one frame period; and the output signal of the frame memory and the input. means for determining the absolute value of the difference between two frames between the high horizontal frequency component of the luminance signal and the color signal component from the signal; the input signal and the output signals of the two frame memories are used as input signals; the passband thereof is NTSC; A spatio-temporal filter that is a region conjugate with the color signal component when expressing a composite television signal of the system in terms of vertical frequency and temporal frequency, and the absolute value of the high horizontal frequency component of the output signal of the spatio-temporal filter. a determination circuit that takes the absolute value and the absolute value of the difference between two frames as input signals and outputs one of the input signals; and a logic between the output signal of the determination circuit and the difference between one frame. 1. A motion detection circuit comprising: means for calculating a sum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22995389A JPH0787597B2 (en) | 1989-09-05 | 1989-09-05 | Motion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22995389A JPH0787597B2 (en) | 1989-09-05 | 1989-09-05 | Motion detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0392093A true JPH0392093A (en) | 1991-04-17 |
| JPH0787597B2 JPH0787597B2 (en) | 1995-09-20 |
Family
ID=16900301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22995389A Expired - Fee Related JPH0787597B2 (en) | 1989-09-05 | 1989-09-05 | Motion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0787597B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5376972A (en) * | 1989-04-12 | 1994-12-27 | Sony Corporation | Video signal transmission/reception using high pass filters for motion detection |
| JPH077746A (en) * | 1993-06-17 | 1995-01-10 | Nec Corp | Motion detection circuit, encoder and decoder |
-
1989
- 1989-09-05 JP JP22995389A patent/JPH0787597B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5376972A (en) * | 1989-04-12 | 1994-12-27 | Sony Corporation | Video signal transmission/reception using high pass filters for motion detection |
| JPH077746A (en) * | 1993-06-17 | 1995-01-10 | Nec Corp | Motion detection circuit, encoder and decoder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0787597B2 (en) | 1995-09-20 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |